Dr Jekyll, a physician conscious of the duality in his own nature (the
repressive nature of his middle-class character and his hidden desires for
pleasure), discovers a drug by means of which he can resolve this conflict
through creating for himself a separate personality embodying his evil
instincts. This identity Jekyll assumes from time to time, by taking his
chemical potion, and whom he calls Mr Hyde, gives reign to his evil
impulses, as was planned. But as the drug gradually loses its efficacy and
as Mr Hyde's ascendant on Jekyll grows, Jekyll finds himself unable to
control his transformations into Hyde and incapable of putting an end to his outrageous behaviourů